document.addEventListener('touchmove', function (e) {
    e.preventDefault()
});
if (document.getElementById('evanyou')) {
    var c = document.getElementById('evanyou'),
        x = c.getContext('2d'),
        pr = window.devicePixelRatio || 1,
        w = window.innerWidth,
        h = window.innerHeight,
        f = 90,
        q,
        m = Math,
        r = 0,
        u = m.PI * 2,
        v = m.cos,
        z = m.random
    c.width = w * pr
    c.height = h * pr
    x.scale(pr, pr)
    x.globalAlpha = 0.6
    function evanyou () {
        x.clearRect(0, 0, w, h)
        q = [{ x: 0, y: h * .7 + f }, { x: 0, y: h * .7 - f }]
        while (q[1].x < w + f) d(q[0], q[1])
    }
    function d (i, j) {
        x.beginPath()
        x.moveTo(i.x, i.y)
        x.lineTo(j.x, j.y)
        var k = j.x + (z() * 2 - 0.25) * f,
            n = y(j.y)
        x.lineTo(k, n)
        x.closePath()
        r -= u / -50
        x.fillStyle = '#' + (v(r) * 127 + 128 << 16 | v(r + u / 3) * 127 + 128 << 8 | v(r + u / 3 * 2) * 127 + 128).toString(16)
        x.fill()
        q[0] = q[1]
        q[1] = { x: k, y: n }
    }
    function y (p) {
        var t = p + (z() * 2 - 1.1) * f
        return (t > h || t < 0) ? y(p) : t
    }
    document.onclick = evanyou
    document.ontouchstart = evanyou
    evanyou()
}
